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Título
Universal route to optimal few- to single-cycle pulse generation in hollow-core fiber compressors
Autor(es)
Assunto
Nonlinear optics
Ultrafast lasers
Clasificación UNESCO
2209.19 Óptica Física
2209.10 láseres
Fecha de publicación
2018
Editor
Nature Publishing Group (Londres, Gran Bretaña)
Citación
Conejero Jarque, E., San Roman, J., Silva, F., Romero, R., Holgado, W., Gonzalez-Galicia, M. A., Alonso, B., Sola, I.J., Crespo, H. (2018). Universal route to optimal few- to single-cycle pulse generation in hollow-core fiber compressors. Scientific Reports, 2256 (8)
Resumen
[EN]The chirped pulse amplification (CPA) technique applied to Titanium Sapphire lasers has made intense
near-infrared (NIR) ultrashort pulses in the 20−100 fs range widely available for scientific, biomedical and industrial
applications. Special efforts have been devoted to generate even shorter pulses, in the few- and single-cycle
regime, due to a number of interesting applications. In particular, such pulses have paved the way for attosecond
physics and metrology, via the extreme ultraviolet (XUV) attosecond pulse trains and isolated attosecond
pulses that can be obtained by high-harmonic generation (HHG). The use of few-cycle optical pulses with
durations close to or shorter than 10 fs in the near-infrared, visible and near-ultraviolet spectral regions has been
extended in recent years to a wide range of spectroscopic techniques such as impulsive vibrational spectroscopy, time-resolved stimulated Raman spectroscopy, and ultrafast pump-probe absorption spectroscopy.
Few-cycle optical pulses have also become an interesting tool for transient absorption microscopy,
near-field imaging techniques and for generating ultrashort terahertz radiation.
While it is possible to obtain sub-10 fs pulses from CPA or from optical parametric amplification systems,
the former is not easy to accomplish, and the latter is not commonplace. Therefore, post-compression techniques
are usually employed for the generation of intense few- and even single-cycle pulses in the near- and mid-infrared
spectral regions. In order to post-compress ultrafast pulses down to the few-cycle regime, two steps are usually
needed. First, nonlinear processes broaden the pulse spectrum, thus decreasing the Fourier-limited pulse
duration. In a second step, the spectral phase resulting from the previous stage is compensated, typically using
chirped mirrors, gratings, prisms, or other dispersive systems, resulting in a temporally compressed pulse. This
scheme was first proposed in the context of optical fibers in the 1980s, and enabled achieving 6 fs pulses when
compensating simultaneously the outcoming group delay dispersion (GDD) and third-order dispersion (TOD).
URI
DOI
10.1038/s41598-018-20580-1
Versión del editor
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